84796721 has 4 divisors (see below), whose sum is σ = 85671012. Its totient is φ = 83922432.

The previous prime is 84796709. The next prime is 84796729. The reversal of 84796721 is 12769748.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52998400 + 31798321 = 7280^2 + 5639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84796721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84796729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437000 + ... + 437193.

It is an arithmetic number, because the mean of its divisors is an integer number (21417753).

Almost surely, 2^84796721 is an apocalyptic number.

It is an amenable number.

84796721 is a deficient number, since it is larger than the sum of its proper divisors (874291).

84796721 is an equidigital number, since it uses as much as digits as its factorization.

84796721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874290.

The product of its digits is 169344, while the sum is 44.

The square root of 84796721 is about 9208.5135065330. The cubic root of 84796721 is about 439.3321842407.

The spelling of 84796721 in words is "eighty-four million, seven hundred ninety-six thousand, seven hundred twenty-one".